Hinged friction-free top-mounted ball valve

Abstract

The utility model relates to a hinged friction-free top-mounted ball valve, which comprises a valve body, a valve cover, a valve rod, a valve core, a valve seat and a stuffing box, the valve rod drives the valve core in the valve body to rotate to open and close, the valve core is hermetically matched with the valve seat, the valve rod is divided into an upper valve rod and a lower valve rod, and the valve core is divided into a left hemisphere, a wedge-shaped pressing block and a right hemisphere. The bottom of the left hemisphere and the bottom of the right hemisphere are hinged to the lower valve rod through pin shafts, the lower valve rod is rotatably positioned in the valve body, sliding grooves are formed in the upper portions of the left hemisphere and the right hemisphere, the left hemisphere and the right hemisphere are connected with the wedge-shaped pressing block through the sliding grooves, and the wedge-shaped pressing block moves downwards to open the left hemisphere and the right hemisphere so that the left hemisphere and the right hemisphere can be sealed with the valve seat. A long-strip-shaped inclined hole is formed in the circumferential wall of the inserting hole, and one end of the cylindrical pin penetrates through the long-strip-shaped inclined hole to be fixedly connected with the upper valve rod. By means of the specific design, the valve has the advantages of being compact in structure, small in valve opening and closing torque, rapid and convenient to open and close, high in sealing performance and long in service life.

Description

Technical Field

[0001] This utility model relates to a hinged frictionless top-mounted ball valve. Background Technology

[0002] Valves, as key control components in long-distance pipelines, play an indispensable role in the transportation of oil and natural gas. Ball valves account for a large proportion of long-distance pipelines, and common types include side-mounted ball valves, fully welded ball valves, and top-loading ball valves.

[0003] Top-entry ball valves hold an important place among pipeline valves due to their unique advantages. Not only do they allow for online maintenance, but compared to side-entry ball valves, the connection between the valve cover and body is not affected by pipeline stress, resulting in a more reliable seal. While the design and manufacturing of top-entry ball valves are relatively mature, common top-entry ball valves still have some drawbacks, such as: 1. The ball is tightly fitted to the valve seat throughout the opening and closing process, resulting in high torque; 2. When installing the ball into the valve body, the valve seat needs to be opened first; 3. To open the valve seat, special tooling is usually required, and sometimes a pressure pump is added externally to push the valve seat backward, leading to complex structure and a high failure rate. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a hinged frictionless top-mounted ball valve. This hinged frictionless top-mounted ball valve has a compact structure, low valve opening and closing torque, quick and convenient opening and closing, strong sealing performance, and long service life.

[0005] The technical solution adopted by this utility model to solve the technical problem is as follows: it includes a valve body, a valve cover, a valve stem, a valve core, a valve seat, and a stuffing box. The valve stem drives the valve core inside the valve body to rotate and open and close. The valve core and the valve seat are sealed together. The valve stem is divided into an upper valve stem and a lower valve stem. The valve core is divided into a left hemisphere, a wedge-shaped pressure block, and a right hemisphere. The bottom of the left and right hemispheres are hinged to the lower valve stem through a pin. The lower valve stem can be rotatably positioned inside the valve body. The upper part of the left and right hemispheres is provided with a sliding groove and is connected to the wedge-shaped pressure block through the sliding groove. The wedge-shaped pressure block moves downward to open the left and right hemispheres so that they are sealed with the valve seat. The wedge-shaped pressure block is provided with a plug hole for plugging into the upper valve stem. An elongated oblique hole is provided on the peripheral wall of the plug hole. One end of the cylindrical pin passes through the elongated oblique hole and is fixedly connected to the upper valve stem.

[0006] The valve seat is threaded to the valve body, and the sealing surface of the valve seat is tapered.

[0007] The upper valve stem is fitted with a disc spring, which presses against the valve cover and the wedge-shaped pressure block. A sliding bearing is provided between the disc spring and the valve cover.

[0008] A dustproof ring is provided on the upper valve stem above the disc spring.

[0009] The upper valve stem is equipped with a thrust bearing, which is a thrust needle roller bearing.

[0010] Through the above-described specific design, this utility model has the following advantages:

[0011] 1. This utility model connects the left and right hemispheres and the lower valve stem into a single unit via a pin hinge. During assembly, the tops of the left and right hemispheres are brought together towards the center. At this point, the width of the ball is less than the distance between the two valve seats, allowing the ball to be directly placed into the valve cavity. Due to its own weight, the ball expands towards both ends to fit the valve seats. The wedge-shaped pressure block moves downward, opening the left and right hemispheres and pressing the ball tightly against the valve seats for a seal. This optimizes the installation process and reduces labor intensity and working time.

[0012] 2. The threaded fixed valve seat of this utility model does not require springs, external pressure pumps or other devices, has a simple structure, and reduces the failure rate and external leakage points.

[0013] 3. The upper valve stem and wedge-shaped pressure block are connected by multiple cylindrical pins, with elongated oblique holes at the connection points. This enables frictionless opening and closing of the valve, effectively reducing valve opening and closing torque, lowering actuator output torque requirements, and reducing user operating costs.

[0014] 4. The conical shape of the valve seat sealing surface ensures effective contact even after the sealing pair wears. After the sealing surface wears, the disc spring can push the wedge-shaped pressure block downward to open the left and right hemispheres, compensating for the wear of the sealing surface and extending the service life of the valve.

[0015] 5. Place a dustproof ring in front of the valve stem packing to prevent impurities from entering the valve stem packing, thereby enhancing sealing performance and extending the valve's service life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the assembly structure of this utility model.

[0018] Figure 2 yes Figure 1 AA sectional view.

[0019] Figure 3 This is a schematic diagram of the left and right hemispheres in the open state of this utility model.

[0020] Figure 4 This is a schematic diagram of the left and right hemispheres in the folded-up state in this utility model.

[0021] Figure 5This is a schematic diagram of the wedge-shaped pressure block in this utility model.

[0022] Figure 6 This is a schematic diagram of the structure of the left hemisphere in this utility model.

[0023] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve stem; 3a. Upper valve stem; 3b. Lower valve stem; 4. Valve core; 5. Valve seat; 6. Left hemisphere; 7. Wedge-shaped pressure block; 8. Right hemisphere; 9. Pin; 10. Slide groove; 11. Stuffing gland; 12. Insertion hole; 13. Long oblique hole; 14. Cylindrical pin; 15. Disc spring; 16. Sliding bearing; 17. Dust ring; 18. Thrust bearing. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] As shown in the figure, this utility model includes a valve body 1, a valve cover 2, a valve stem 3, a valve core 4, a valve seat 5, and a stuffing box 11. The valve stem 3 drives the valve core 4 inside the valve body 1 to rotate and open / close. The valve core 4 is sealed to the valve seat 5. The valve stem 3 is divided into an upper valve stem 3a and a lower valve stem 3b. The valve core 4 is divided into a left hemisphere 6, a wedge-shaped pressure block 7, and a right hemisphere 8. The bottoms of the left hemisphere 6 and the right hemisphere 8 are hinged to the lower valve stem 3b via a pin 9. The lower valve stem 3b is rotatable. Positioned within the valve body 1, the left hemisphere 6 and right hemisphere 8 have upper grooves 10 that connect to a wedge-shaped pressure block 7. The wedge-shaped pressure block 7 moves downward to open the left hemisphere 6 and right hemisphere 8, sealing them against the valve seat 5. The wedge-shaped pressure block 7 has an insertion hole 12 for insertion into the upper valve stem 3a. An elongated oblique hole 13 is formed on the peripheral wall of the insertion hole 12, and one end of a cylindrical pin 14 passes through the elongated oblique hole 13 and is fixedly connected to the upper valve stem 3a. In this invention, the left hemisphere 6, right hemisphere 8, and lower valve stem 3b are hinged together as a whole by a pin 9. During assembly, the tops of the left hemisphere 6 and right hemisphere 8 are brought together towards the center. At this time, the width of the ball is less than the distance between the two valve seats, allowing the ball to be directly placed into the valve cavity. Due to its own weight, the ball opens to both ends to fit against the valve seat 5. The wedge-shaped pressure block 7 moves downward, opening the left hemisphere 6 and right hemisphere 8 and pressing the valve seat to seal. The upper valve stem 3a is connected to the wedge-shaped pressure block 7 by multiple cylindrical pins 14, with the connection point using an elongated oblique hole 13. When the valve is opened, the valve stem drives the cylindrical pins 14 to slide in the elongated oblique hole 13 of the wedge-shaped pressure block 7, rotating from hole B to hole A. Figure 5 The wedge-shaped pressure block is slightly lifted, causing the left hemisphere 6 and right hemisphere 8 to converge towards the center and disengage from the valve seat sealing surface. The valve stem continues to rotate, driving the ball to the open position, achieving frictionless opening of the ball, and vice versa, achieving frictionless closing. The valve seat 5 is threaded to the valve body 1. The threaded fixed valve seat eliminates the need for springs, external pressure pumps, and other devices, simplifying the structure and reducing the failure rate and external leakage points. The sealing surface of the valve seat 5 is conical, with a disc spring 15 sleeved on the upper valve stem 3a. The disc spring 15 presses against the valve cover 2 and the wedge-shaped pressure block 7, and a sliding bearing 16 is provided between the disc spring 15 and the valve cover 2. After long-term opening and closing operations, the sealing surface of the valve will experience slight wear. The conical sealing surface of the valve seat in this invention ensures effective contact even after the sealing pair wears. After the sealing surface wears, multiple sets of disc springs can push the wedge-shaped pressure block 7 downward to open the left hemisphere 6 and right hemisphere 8, compensating for the wear of the sealing surface and extending the service life of the valve. A dustproof ring 17 is installed on the upper valve stem 3a above the disc spring 15. Pipeline media often contain impurities, which can enter the valve stem packing. Repeated opening and closing can cause packing wear and leakage. Placing the dustproof ring 17 in front of the valve stem packing prevents impurities from entering, enhances sealing performance, and extends valve life. A thrust bearing 18 is installed on the upper valve stem 3a; the thrust bearing 18 is a thrust needle roller bearing.

[0029] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.

Claims

1. A hinged frictionless top entry ball valve comprising a valve body, a bonnet, a stem, a disc, a seat and a stuffing box, the stem driving the disc in the valve body to rotate to open and close, the disc sealing with the seat, characterized in that The valve stem (3) is divided into upper valve stem (3a) and lower valve stem (3b), the valve core (4) is divided into left hemisphere (6), wedge-shaped block (7) and right hemisphere (8), the bottom of left hemisphere (6) and right hemisphere (8) is hinged with lower valve stem (3b) through pin shaft (9), lower valve stem (3b) can be rotatably positioned in valve body (1), the upper part of left hemisphere (6) and right hemisphere (8) is provided with sliding slot (10) and is connected with wedge-shaped block (7) through sliding slot (10), wedge-shaped block (7) moves downward to open left hemisphere (6) and right hemisphere (8) to make it seal with valve seat (5), the upper part of wedge-shaped block (7) is provided with plug-in hole (12) and is plugged with upper valve stem (3a), the circumferential wall of plug-in hole (12) is provided with long oblique hole (13), one end of cylindrical pin (14) passes through long oblique hole (13) and is fixedly connected with upper valve stem (3a).

2. A hinged frictionless top-loading ball valve according to claim 1, characterized in that Valve seat (5) is screw-connected to valve body (1), the sealing surface of valve seat (5) adopts a conical shape.

3. A hinged frictionless top-loading ball valve according to claim 1 or 2, characterized in that Upper valve stem (3a) is provided with disc spring (15), disc spring (15) is pressed between valve cover (2) and wedge-shaped block (7), sliding bearing (16) is arranged between disc spring (15) and valve cover (2).

4. A hinged frictionless top-entry ball valve according to claim 3, characterized in that Upper valve stem (3a) is provided with dust ring (17) above disc spring (15).

5. A hinged frictionless top-entry ball valve according to claim 4, characterized in that Upper valve stem (3a) is provided with thrust bearing (18), thrust bearing (18) adopts a thrust needle bearing.

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